John Roger Johnson, 73, of Derwood John Johnson could have retired years ago, but a longtime family friend said the man they referred to as "JJ" loved the work. For years, the 73-year-old father of four daughters - the oldest victim killed - worked as an engineer at the Navy Yard. "The sad part...

John Roger Johnson, 73, of Derwood John Johnson could have retired years ago, but a longtime family friend said the man they referred to as "JJ" loved the work. For years, the 73-year-old father of four daughters - the oldest victim killed - worked as an engineer at the Navy Yard. "The sad part... (Courtesy of the Johnson Family)

John Roger Johnson, 73, of Derwood John Johnson could have retired years ago, but a longtime family friend said the man they referred to as "JJ" loved the work. For years, the 73-year-old father of four daughters - the oldest victim killed - worked as an engineer at the Navy Yard. "The sad part...